Dressing-block



(a. A. MONTGOMERY.

DRESSING BLOCK. APPLICATION FILED AUG-2. 1920.

Patented Nov. 8, 1921.

2 SHEETSSHEET 1.

G. A. MONTGOMERY.

DRESSING BLGCK.

APPLICATION FILED AUG-2, 1920.

1 96,340, Patented Nov. 8, 19 21.

2 SHEETS-SHEET 2.

GUSTAVUS A. MONTGOMERY, OF DALLAS,

GUIBERSON CORPORATION, OF DALLAS,

TEXAS, ASSIGNOR ONE-HALF TO THE TEXAS, A CORPORATION OF DELAWARE.

DRESSING-BLOCK.

Specification of Letters Patent.

Patented Nov. 8, 1921.

Application filed August 2, 1920. Serial No. 400,697.

To (ZZZ whom it may concern:

Be it known that I, GUSTAVUS A. MONT- GOMERY, acitizen of the Republic of Finland, residing at Dallas, in the county of allas and Stateof Texas, have invented certain new and useful Improvements in Dressing-Blocks, of which the following is a specification.

This invention relates to new and useful improvements in dressing blocks.

he purpose of the invention is to provide a dressing block for well drilling tools. The particular result sought isthe provision of an anvil to which the work may be readily adjusted and whereby the tool may be properly supported, so that said tool may be dressed in asatisfactory and eflicient manner. An important feature lies in means for supporting an underreamer bit body and cutter face as well as the shoulder thereof, whereby the body will not be displaced outwardly with relation to the shank, thus maintaining the alinement of the parts during the dressing operation. A further aim of the invention is to provide means for adjusting the tool and the anvil so that tools of different lengths and difierent sizes, may .be readily accommodated and properly dressed.

Another end sought to be obtained is the provision of a dressing block or device, in which simplicity and convenience will be combined with a maximum stability, whereby the anvil will undergo the strain and shock resulting from the severe hammering given the tool when the same is being dressed or reshaped.

In carryingout the invention I provide a base member or support of a very substantial nature, and associate with this invention a core which has its upper end shaped to receive the shank of a. well bit,

other tool and also to support said bit in an inverted position. An anvil is carried by the base and the core is mounted in the base relatively within the anvil, which latter, however, may only partially surround the core. The anvil at its upper end is provided with an internal arcuate dressing shoulder which is inclined to conform to the angle to which it is desired to reshape or dress the cutting edge of the bit. Considerable strength is given to the anvil by its construction and provision is made for distributing the impact sustained by the shoulder. The

anvil being projected above the core, will support the body and cutting faces of the tool andprevent an outward bending of the body with relation to the shank, while redressing.

It will be apparent that in a bit, unless some means was the case of an anvil having a dressing shoulder and sustaining wall.

necessary to provide a rela vertically between the anvil and the core which supports the tool. adjustment may be efi'ected either by vertically adjusting the anvil with relation to the core, or vertically adjusting the core with relation to the anvil. It is obvious that without adjustment only one length or depth of tool could be used. and as the tool ecomes shorter each time it is heated and dressed, it is necessary to bring a will be obvious.

he invention will be more readily understood from a reading of the following specification and by reference to the accompan ing drawings, in which an example of the invention is shown, and wherein:

Figure l is a vertical sectional view of a dressing block constructed in accordance with my invention,

Fig. 2 is a plan view of the same,

Fig. 3 is a partial front elevation of the face member,

Fig. 4 is a vertical sectional view of a modified form of the invention,

Fig. 5 is a cross sectional view on the line 5-5 of Fig. 4,

Fig. 6 is a vertical sectional view of still another form of the invention, and

Fig. 7 is a plan view of the same.

lowever, in order to get the In the drawings the numeral 10 designates a cylindrical base member having an outwardly directed annular flange 11, on which it is supported. The flange 11 is provided with apertures 11 through which fastenings may be passed to secure the base to a fixed support. The base member has an opening or-chamber 12 in its bottom and is provided with a central bore 13 extend ing downwardly fromits upper end. An anvil member 1 1 formedintegral with the base extends upwardly therefrom. The anvil ,isin the form of an arcuate wall or web and preferably has its outer surface contiguous to the outer surface of'the base member, but this is notnecessary. The web has its ends 15inclined downwardly which adds to the stability and braces the anvil member. At the upper end of the web 14; an outwardly and upwardly inclined shoulder 16 is provided. This shoulder is given a height equal to the face of thecutter which it is desiredto dress on the anvil.

A cylindrical core 17 fits snugly in the bore 13 and is supported centrally therein by an adjusting screw17 extending from the chamber 12 up through the base 10 and into. said borej The screw17 is provided with an angular collar 18 similar to a nut so that by inserting a suitable wrench through a slot 19 in the base, and engaging said wrench with the collar, the screw 17 may be turned and the core adjusted vertically or axially. However, the core might beadjusted otherwise. The corehas a fiat vertical panel 20 on what might be termed its front side. A set screw .21 threaded in thezbase 10 engages said panel and by tightening the screw, the core 17 may be fastened in the position to which it has been adjusted. j

I have illustrated the invention in connection with an underrcamer bit, but it is to be understood that the invention is'not to be limited either to the particular form of bit shown, or this particular tool. Underreamer bits are usually formed with a body A, a cuttingface B, a body face C, a shoulder D and a shank E. The particular construction varies, but these parts are usually found. I, therefore, provide the core 17 with a taperedsocket 22 terminatingin a transverseopening 23 at its bottom. I also cut away the core so as to provide a counter-sunk shoulder 2 1. The bit A is inverted and its shank E inserted in the socket 221 so that its lower end depends into the opening 23. The shoulder D is thus supported on the shoulder 24 and the shank is sustained by the inclined walls of the socket. One of the very important features of this invention is the extension of the anvil member above the shoulder of the core, whereby a support is provided for the body of the bit and itsfaceC as well as the cutter face B. It is, of course, understood that in dressing a bit the latter is first heated and it will be seen that it is impossible to heat the bit without heating the shank, therefore, if no support was provided for the upper end of the bit when it is placed in the dressing block, blows delivered on the upper end would have a "tendency to bend the bit outwardly fromits shank. This not only causes a distortion of the bit, whereby its shoulder and shank are drawn out of line, but tends to spread the great and thus further work must be done irrespective of thebad results had from such an operation. It will be seen that by adjusting the core 17. to such a height as to bring the cutting end of the bit into the proper position to be hammered onto the shoulder 16, the'bit cannot be spread and it will be fi-nished'at the exact radius which is desired. This adjustment may be controlledto a nicety as is obvious- Further the anvil supports the body face and cutter face of the bitso thatthese faces perfectly fit the anvil member and cannot be distorted.

In dressing the same is subjected sledge hammer which are directed downwardly and outwardly whereby the cutter is upset onto theshoulder' 16. This causesthe anvil. web 14: to undergo a severe strain and to brace the web, radial ribs 25 extend from the top of the anvil to the base flange 11. These ribs distribute the strain and brace the anvil in a very efiicient manner. Itwill be seen that the core 17 maybe readily adjusted and other cores for receiving the shank of a different make of bit or a different size of bit may be easily substituted. It will be noted that the core 17 is also provided with asocket 22" and a counter-sunk shoulder 24: in opposed relation to the socket 22 and shoulder 24:. The reason for this is thata companion well bit may be inserted in the core so that its shank will be received in the socket 22' and itsshoulder will rest on the shoulder 24. The cuttershould then correspond with the cutter of the bit and by applying a gage it can be readily determined if the bit has been dressed to the proper radius as will be obvious. This is a very useful feature and bit the cutter end of the will obviate the necessity and delay of in serting the bits in the reamer body before gaging'the same.

While it ispreferable toform the base and anvil in a single solid formation, the invention may. be carried out by employing various structures. In Figs. f and 5 I have shown a cylindricalbase 10- having an outwardly directed annular base flange 30 provided with bolt holes 31. A central chamber-12 extends upwardly from the bottom of the base and terminates in an enlarge bit so that its radius is too to severe blows from a cylindrical bore 13. A cylindrical core 17' fits snugly in the bore 13 and is provided with a socket 32 and a transverse opening 33. This core also has a counter-sunk shoulder 34.

The base 10' screw-threads 35 screw-threads 36 is provided with external for receiving the internal of an anvil 14, which in this instance is in the form of a sleeve. At its upper end the anvil is provided with an inclinedshoulder 16 which in this instance is annular, but has the same function as the shoulder 16. To lend strength an annular bead 37 is formed on the upper edge around the anvil sleeve and ribs 38 extend downwardly, diminishing toward the bottom of said sleeve. In this form the adjustment is had by inserting a tool in openings 39 in the anvil sleeve, and rotating the latter until the shoulder 16 is brought to the proper elevation to receive the face B of the bit A. The bit is dressed and supported with its portions in engagement with the parts, the same as in Fig. 1.

In Figs. 6 and 7 I have shown a slightly different form which is especially adapted for small bits. In this form the base 10 is provided with a flange 30 and a chamber 12 terminating at the bottom of a bore 13 which receives a core 17. The core is provided with a reduced pedestal 40 which is provided with a tapered socket 32' terminating at a transverse opening 33. The pedestal has a counter-sunk shoulder 34. he base member is provided with external screw-threads 35 which receive the internal screw-threads 36 of an anvil sleeve 14* similar to the sleeve 14. The upper portion 14" of the sleeve is reduced in diameter so as to conform to the pedestal 40. The sleeve has an annular dressing shoulder 16 at its upper end and is also provided with a circumferential bead 37. The sleeve is adjustable the same as in the case of the sleeve 14' and the bit A is sustained and supported in the same manner. Below the bead 37' the sleeve is provided with strengthening ribs 38'.

Too much stress cannot be laid upon the anvil wall which extends above the base and also above the upper end of the core, together with the dressing shoulder; whereby the body and cutting edge of the bit as well as the shoulder of said bit are sustained and supported while being dressed. As before stated this prevents a distortion of the bit which would result in the body being thrown out of line with relation to the shank and also might cause the outward displacement of the body to an excessive degree; whereby the cutting edge would be at too great a radius and the bit would have to be reheated and redressed, and also have to be reshaped so that the normal relation between the shank and the bit body could be restored. In fact by supporting and sustaining the body, the shoulder and the shank of the bit, it is obvious that when the bit is dressed, the tendency will be to conform the bit to its proper shape and thus if it happens to be out of shape or out of line, it will be restored. that a device of this nature would be used in the field and, therefore, it must be substantial as well as eflicient. The provision of the two sockets whereby a pair of bits may be inserted inthe exact relation they occupy in a reamer body, so that they may e gaged for their cutting diameter, is extremely important and advantageous as Well as a great time saver.

I'Vhat I claim, is:

1. In a dressing block, a support, a core carried by the support and having an opening for receiving a tool to be dressed, an anvil member projecting above the core for supporting the tool, and a dressing shoulder on the anvil member.

2. In a dressing block, a support, a core for supporting a tool to be dressed, and an anvil member for supporting the tool against lateral displacement and having an arcuate inclined dressing shoulder.

3. In a dressing block, a support, a core for supporting a tool to be dressed, an anvil member for supporting the tool laterally and having a dressing shoulder, and means for effecting a relative vertical adjustment between the core and the anvil member.

4. In a dressing block, a support,-a core carried by the support and having a socket for receiving the shank of a well tool and also being provided with a shoulder for supporting the shoulder of a well tool, and an anvil member projecting above the core for supporting the tool and being provided with a dressing shoulder.

5. In a dressing block, a support, a core carried by the support and having a socket for receiving the shank of a well tool and also being provided with a shoulder for supporting the shoulder of a well tool, an anvil member projecting above the core for supporting the tool and being provided with a dressing shoulder, and means for effecting a relative vertical adjustment between the core and the anvil member.

6. In a dressing block, a base member, an upright core mounted on the base and having a socket for receiving an inverted tool, and an anvil member within which the core is disposed, said anvil member having an arcuate dressing shoulder at its upper end.

7. In a dressing block. a support, an anvil member having a dressing shoulder, and a core for supporting a well drilling bit in contact with the side of the anvil member.

8. In a dressing block. a support, an anvil member having a dressing shoulder, and a core having a socket for receiving an invert- It will be understood ed well bit and supporting the samein eontaet with the anvil member, said core also havinga second socket for receiving a second well bit inopposed relation to the first bit for gaging the diameter of the bits.

9. In a dressing block, a base, an anvil member integral with the base and having an arcuate dressing shoulder, a core mounted onthe base and having a socket for receiving a tool to be dressed on the anvil, and means for vertically adjusting the core with relation to the anvil member.

I 10. In a dressingbloek, a base member, an annular base flange carried by the base member, a web extending upwardly from the base and constituting an anvil, an arouate dressing shoulder at the upper end of the web, a coremounted on the base and having a socket for receiving an inverted well bit, means for adjusting the core vertically, and means for fastening position. 7

In testimony whereof I afiix my signature;

GUSTAVUS A. MONTGOMERY.

the core in its ad uSted' 

